OAKLAND -- Fireworks thrown from a moving car were to blame for a half-dozen small grass fires along Interstate 580 in Oakland on Saturday morning, a fire spokesman said.

Firefighters from seven fire engines responded about 10:18 a.m. to a call for a brush fire along I-580 between Grand and 14th Avenue after witnesses dialed 911 and reported seeing smoke near the overpass, said Oakland Fire Battalion Chief Geoff Hunter.

The fires were under control by about noon, and fire crews remained on scene investigating the cause of the blaze.

Hunter said that shortly before the fires broke out, the California Highway Patrol received reports of a vehicle with an unknown description with four males inside who were shooting fireworks out of the vehicle's windows as the car headed east on I-580. No description of the suspects was immediately available.